package com.heima.media.filter;


import com.heima.media.utils.AppJwtUtil;
import io.jsonwebtoken.Claims;
import lombok.extern.slf4j.Slf4j;
import org.springframework.cloud.gateway.filter.GatewayFilterChain;
import org.springframework.cloud.gateway.filter.GlobalFilter;
import org.springframework.core.Ordered;
import org.springframework.http.HttpStatus;
import org.springframework.http.server.reactive.ServerHttpRequest;
import org.springframework.http.server.reactive.ServerHttpResponse;
import org.springframework.stereotype.Service;
import org.springframework.util.StringUtils;
import org.springframework.web.server.ServerWebExchange;
import reactor.core.publisher.Mono;

@Service
@Slf4j
public class AuthFilter implements GlobalFilter, Ordered {
    @Override
    public Mono<Void> filter(ServerWebExchange exchange, GatewayFilterChain chain) {
        //获得请求头和响应体
        ServerHttpRequest request = exchange.getRequest();
        ServerHttpResponse response = exchange.getResponse();
        String path = request.getURI().getPath();
        //包含login，直接就可以放行
        if(path.contains("/login")){
            return  chain.filter(exchange);
        }
        //判断请求头中是否携带token
        String token = request.getHeaders().getFirst("token");
        if(!StringUtils.isEmpty(token)){
            try {
                Claims claimsBody = AppJwtUtil.getClaimsBody(token);
                //查看是否过期
                int status = AppJwtUtil.verifyToken(claimsBody);
                if(status==-1||status==0){
                    //有效的话，放入请求头转发给后端的微服务
                    Object userId = claimsBody.get("userId");
                    request.mutate().header("userId",userId.toString());
                    return chain.filter(exchange);
                }
            }catch (Exception e){
                log.error(e.getMessage());
            }
        }

        //返回未授权的状态
        response.setStatusCode(HttpStatus.UNAUTHORIZED);
        return  response.setComplete();
    }

    @Override
    public int getOrder() {
        return 0;
    }
}
